Features: Improve the speedImprove the speed and feed rate of the tool ,Improve the surface wear resistance.Bit is constructed of high speed steel reduces friction and over-heated for the best combination of strength, heat resistance and wear resistance. Guiding partThe straight shank drill is mainly composed of a handle and a working part. The guiding part of the working part is guided and prepared for grinding, and the chip pocket is spiraled to facilitate the guiding. Use rangeUsing high-speed steel, is the most commonly used material for tooling tools. It is suitable for drilling holes in angle iron, wood, plastic, aluminum alloy and other materials. Home is more suitable! Multi sizes set99 Pcs Drill Bit Set in different sizes 1.5-10mm:1.5mm/0.06inch, 2mm/0.08inch, 2.5mm/0.1inch, 3mm/ 0.12inch, 3.2mm/0.13inch, 3.5mm/0.14inch, 4mm/0.16inch, 4.5mm/0.18inch, 5mm/0.2inch, 5.5mm/0.22inch, 6mm/0.24inch, 6.5mm/0.26inch, 8mm/0.31inch 10mm/0.39. High-speed steel materialYou can also choose bit set of 230:1mm 32pieces, 1.5mm 30pieces, 2.0mm 30pieces, 2.5mm 30pieces, 3.0mm 20 pieces, 3.5mm 20pieces, 4.0mm 20pieces, 4.5mm 12pieces, 5.0mm 12pieces, 5.5mm 8pieces, 6.0mm 4pieces, 6.5mm 6pieces, 7.0mm 4pieces , 7.5mm 2 pieces, 8.0mm 3 pieces, 8.5mm 2 pieces, 9.0mm 1 pieces, 9.5mm 1 pieces, 10.0mm 1 pieces. Specifications: Material: titanium plating on speed steel Color: gold Size(about): case: 196x210x35mm/7.72x8.23x1.38inch(LxWxH) drill bit(99pcs): cutter dia: 1.5mm/0.06inch, 2mm/0.08inch, 2.5mm/0.1inch, 3mm/ 0.12inch, 3.2mm/0.13inch, 3.5mm/0.14inch, 4mm/0.16inch, 4.5mm/0.18inch, 5mm/0.2inch, 5.5mm/0.22inch, 6mm/0.24inch, 6.5mm/0.26inch, 8mm/0.31inch 10mm/0.39inch drill bit(230pcs):cutter dia: 1mm/0.04inch, 1.5mm/0.06inch, 2mm/0.08inch, 2.5mm/0.1inch, 3mm/ 0.12inch, 3.5mm/0.14inch, 4mm/0.16inch, 4.5mm/0.18inch, 5mm/0.2inch, 5.5mm/0.22inch, 6mm/0.24inch, 6.5mm/0.26inch, 7mm/0.28inch, 7.5mm/0.3inch, 8mm/0.31inch, 8.5mm/0.33inch, 9mm/0.35inch, 9.5mm/0.37inch, 10mm/0.39inch Package Included: 99pcs x drill bit with case Or 230pcs x drill bit Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.